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<div class="header">
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<div class="title">PriorityQueue.cs</div>  </div>
</div><!--header-->
<div class="contents">
<a href="_priority_queue_8cs.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">using</span> System;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="keyword">using</span> System.Collections.Generic;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="keyword">using</span> System.Diagnostics.Contracts;</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="keyword">using</span> System.Linq;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="keyword">using</span> System.Text;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="keyword">namespace </span>SystemSharp.Collections</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;{</div>
<div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html">   33</a></span>&#160;    <span class="keyword">public</span> <span class="keyword">class </span>PriorityQueue&lt;T&gt;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    {</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;        <span class="keyword">public</span> delegate T ResolveFunc(T v1, T v2);</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        <span class="keyword">private</span> <span class="keyword">class </span>PQItem</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;        {</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;            <span class="keyword">public</span> <span class="keywordtype">long</span> Key { <span class="keyword">get</span>; set; }</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;            <span class="keyword">public</span> T Value { <span class="keyword">get</span>; set; }</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;            <span class="keyword">public</span> PQItem[] Children { <span class="keyword">get</span>; <span class="keyword">private</span> set; }</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;            <span class="keyword">public</span> PQItem(<span class="keywordtype">long</span> key, T value)</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;            {</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;                Key = key;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;                Value = value;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;                Children = <span class="keyword">new</span> PQItem[2];</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;            }</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;        }</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;</div>
<div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#a06fe599c6fff3e41635efaf291d74957">   67</a></span>&#160;        <span class="keyword">public</span> ResolveFunc Resolve { <span class="keyword">get</span>; set; }</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;        <span class="keyword">private</span> PQItem _root;</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;        <span class="keyword">private</span> <span class="keywordtype">void</span> Enqueue(PQItem item, PQItem root)</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;        {</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;            Contract.Requires&lt;ArgumentNullException&gt;(item != null);</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;            Contract.Requires&lt;ArgumentNullException&gt;(root != null);</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;            <span class="keywordflow">if</span> (item.Key == root.Key)</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;            {</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;                root.Value = Resolve(root.Value, item.Value);</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;            }</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;            <span class="keywordflow">else</span> <span class="keywordflow">if</span> (item.Key &lt; root.Key)</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;            {</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;                <span class="keywordflow">if</span> (root.Children[0] == null)</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;                    root.Children[0] = item;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;                <span class="keywordflow">else</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;                    Enqueue(item, root.Children[0]);</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;            }</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;            <span class="keywordflow">else</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;            {</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;                <span class="keywordflow">if</span> (root.Children[1] == null)</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;                    root.Children[1] = item;</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;                <span class="keywordflow">else</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;                    Enqueue(item, root.Children[1]);</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;            }</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;        }</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#a93fbc7fed575239db6c254b5c8d4a8dd">  101</a></span>&#160;        <span class="keyword">public</span> <span class="keywordtype">void</span> <a class="code" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#a93fbc7fed575239db6c254b5c8d4a8dd">Enqueue</a>(<span class="keywordtype">long</span> key, T value)</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        {</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;            PQItem pqi = <span class="keyword">new</span> <a class="code" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html">PriorityQueue&lt;T&gt;</a>.PQItem(key, value);</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;            <span class="keywordflow">if</span> (_root == null)</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;                _root = pqi;</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;            <span class="keywordflow">else</span></div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;                Enqueue(pqi, _root);</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;        }</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;</div>
<div class="line"><a name="l00113"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#a91e4dcb4ad3f749e62eca1c17e35b975">  113</a></span>&#160;        <span class="keyword">public</span> KeyValuePair&lt;long, T&gt; <a class="code" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#a91e4dcb4ad3f749e62eca1c17e35b975">Dequeue</a>()</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;        {</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;            <span class="keywordflow">if</span> (_root == null)</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;                <span class="keywordflow">throw</span> <span class="keyword">new</span> InvalidOperationException(<span class="stringliteral">&quot;priority queue is empty!&quot;</span>);</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;            PQItem cur = _root;</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;            PQItem parent = null;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;            <span class="keywordflow">while</span> (cur.Children[0] != null)</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;            {</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;                parent = cur;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;                cur = cur.Children[0];</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;            }</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;            <span class="keywordflow">if</span> (parent == null)</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;            {</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;                _root = cur.Children[1];</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;            }</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;            <span class="keywordflow">else</span></div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;            {</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;                parent.Children[0] = cur.Children[1];</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;            }</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;            <span class="keywordflow">return</span> <span class="keyword">new</span> KeyValuePair&lt;long, T&gt;(cur.Key, cur.Value);</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;        }</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;</div>
<div class="line"><a name="l00141"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#aa355badcc9d947a5494a3206381610a7">  141</a></span>&#160;        <span class="keyword">public</span> KeyValuePair&lt;long, T&gt; <a class="code" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#aa355badcc9d947a5494a3206381610a7">Peek</a>()</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;        {</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;            <span class="keywordflow">if</span> (_root == null)</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;                <span class="keywordflow">throw</span> <span class="keyword">new</span> InvalidOperationException(<span class="stringliteral">&quot;priority queue is empty!&quot;</span>);</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;            PQItem cur = _root;</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;            PQItem parent = null;</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;            <span class="keywordflow">while</span> (cur.Children[0] != null)</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;            {</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;                parent = cur;</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;                cur = cur.Children[0];</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;            }</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;            <span class="keywordflow">return</span> <span class="keyword">new</span> KeyValuePair&lt;long, T&gt;(cur.Key, cur.Value);</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;        }</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;        <span class="keyword">public</span> <span class="keywordtype">bool</span> IsEmpty</div>
<div class="line"><a name="l00161"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#a539376a66991c8e0cc9cf1395c79a304">  161</a></span>&#160;        {</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;            <span class="keyword">get</span></div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;            {</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;                <span class="keywordflow">return</span> _root == null ? <span class="keyword">true</span> : <span class="keyword">false</span>;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;            }</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;        }</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;    }</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;}</div>
<div class="ttc" id="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4_html"><div class="ttname"><a href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html">SystemSharp.Collections.PriorityQueue&lt; T &gt;</a></div><div class="ttdoc">A priority queue implementation which resolves collisions (i.e. multiple elements for same key) using...</div><div class="ttdef"><b>Definition:</b> <a href="_priority_queue_8cs_source.html#l00033">PriorityQueue.cs:33</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4_html_aa355badcc9d947a5494a3206381610a7"><div class="ttname"><a href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#aa355badcc9d947a5494a3206381610a7">SystemSharp.Collections.PriorityQueue&lt; T &gt;.Peek</a></div><div class="ttdeci">KeyValuePair&lt; long, T &gt; Peek()</div><div class="ttdoc">Returns the element with highest priority, i.e. lowest key, but does not remove it. </div><div class="ttdef"><b>Definition:</b> <a href="_priority_queue_8cs_source.html#l00141">PriorityQueue.cs:141</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4_html_a91e4dcb4ad3f749e62eca1c17e35b975"><div class="ttname"><a href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#a91e4dcb4ad3f749e62eca1c17e35b975">SystemSharp.Collections.PriorityQueue&lt; T &gt;.Dequeue</a></div><div class="ttdeci">KeyValuePair&lt; long, T &gt; Dequeue()</div><div class="ttdoc">Removes and returns the element with highest priority, i.e. lowest key. </div><div class="ttdef"><b>Definition:</b> <a href="_priority_queue_8cs_source.html#l00113">PriorityQueue.cs:113</a></div></div>
<div class="ttc" id="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4_html_a93fbc7fed575239db6c254b5c8d4a8dd"><div class="ttname"><a href="class_system_sharp_1_1_collections_1_1_priority_queue_3_01_t_01_4.html#a93fbc7fed575239db6c254b5c8d4a8dd">SystemSharp.Collections.PriorityQueue&lt; T &gt;.Enqueue</a></div><div class="ttdeci">void Enqueue(long key, T value)</div><div class="ttdoc">Inserts element value  for specified key . Lower key means higher priority. </div><div class="ttdef"><b>Definition:</b> <a href="_priority_queue_8cs_source.html#l00101">PriorityQueue.cs:101</a></div></div>
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